package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void add(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //查询购物车表，判断添加的商品是否已在数据表中存在
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size()>0){
            //若存在，直接数量加一
            ShoppingCart shoppingCart1 = list.get(0);
            shoppingCart1.setNumber(shoppingCart1.getNumber()+1);
            shoppingCartMapper.updateNumber(shoppingCart1);
        }else{
            //若不存在，插入一条数据，并判断是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                //若为菜品，则添加相关菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());

            }else{
                //若为套餐，则添加相关套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                SetmealVO setmealVO = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmealVO.getName());
                shoppingCart.setAmount(setmealVO.getPrice());
                shoppingCart.setImage(setmealVO.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void deleteOnlyOne(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //查询购物车表，并判断商品数量
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            ShoppingCart shoppingCart1 = list.get(0);

            if(shoppingCart1.getNumber() == 1){
                //若商品数量为1，则删除该项记录
                shoppingCartMapper.deleteOnlyOne(shoppingCart1);
            }else{
                //若商品数量不为1，则该项商品数量减一
                shoppingCart1.setNumber(shoppingCart1.getNumber() - 1);
                shoppingCartMapper.updateNumber(shoppingCart1);
            }
        }
    }
}
